Hi! I'm totally new to Lightroom CC, so I'd love to know if I can use my presets, which I used in "the old" Lightroom in the Lightroom CC program? And if so, how can I import them there? Can't find anything...

At the top of the presets panel in the new Lightroom CC there is an icon that will enable you to open the presets folder. Then you can open the presets folder from your other Lightroom program and copy the presets from that folder into the new Lightroom CC folder. Then the presets will be available to use.